AngularJS, developed by Miško Hevery and Adam Abrons in 2009, has come a long way in the past few years. It now serves as the backbone for many reusab...
AngularJS, developed by Miško Hevery and Adam Abrons in 2009, has come a long way in the past few years. It now serves as the backbone for many reusable and maintainable web applications, developed by big firms, including Fortune 500 companies, around the world.
A Little Bit About AngularJS
Some of the Best AngularJS Features
With AngularJS its easy to divide a web application into smaller, reusable and functional components that can work collectively. That way components can be developed separately and then integrated with other web applications. Each and every module is identified with a unique name and will show dependency from the others when connected to an app.
The MVC (Model-View-Controllers) framework of AngularJS doesn’t work like the traditional MVC framework. The way it functions is much closer to how the Model-View-ViewModel (MVVM) works. Used to split the web application into a manageable structure.
- These represent java-based objects that help showcase the data utilized by the application. Models are also used to express the current status of the application. Basically, you use the model to read or update you app data.
- The ViewModel object provides specific data and methods to maintain specific views. This is the Scope of the AngularJS application.
- The view is the HTML that includes markups and bindings. It basically handles the layout and interactions so the controller responds correctly.
Now that we have looked at modules and the framework we can move onto the good stuff.
Data binding is probably one of, if not, the best features of AngularJS. With data binding there’s no need to manually tweak the DOM elements to see any changes done. This eliminates about 80% of an app’s code base so developers can focus on what’s really important for the client.
Coding any application is a difficult task. Even making a simple web app can get complicated when it comes to coding. Developers often have to code, re-code and constantly eliminate errors that eventually adds up to wasted time. But with AngularJS developers can save time because models can bind to HTML elements. When a model changes, the view is updated automatically and similarly, any change made in the view is reflected in the model. This then reduces the coding meant for keeping both the model and view in sync.
- AngularJS enables the extension of HTML with new attributes called ‘Directives’. These directives are applied in the view. When these directives are attached to the HTML elements and attributes, it creates a dynamic web page. Some examples are ‘ng-app’ to initialize the app and ‘ng-include’ to display extracted data from an external file. Directives then provide a projection of your model to the app view making changes & updates seamless. Directives can also create custom HTML tags that function as custom widgets or be used to decorate elements with behavior and manipulate DOM attributes.
AngularJS uses two-way data-binding to synchronize data between the DOM and the model, and vice versa. This feature lets developers interpret interactions, merging them into a model, and update the view automatically.
AngularJS comes with plenty of built-in services that can’t be initiated more than once during app development. These are actually singleton objects. For instance, $https can be used to make XML Http Requests. These singleton objects are used with controllers, filters and directives, and are used to organize and share code across the application. Some built-in services that always start with ‘$’ symbol like $provide, $resource, $window, $parse and $http can create user-defined services, as per client requirements.
A filter is a case-sensitive, pre-defined keyword, used with a pipe symbol. These are used with controllers, view-templates, services, and directives, and basically format data before displaying it to the user. Although there are some built-in filters like Orderby, UpperCase, LowerCase, Number, Date and Currency some user-defined filters can also be created.
Form Validation in AngularJS helps create modern HTML-based forms that are 100% customer-friendly and responsive. Custom validators can also be developed for an even more customized web app.
An Angular JS application is testable with an end-to-end and unit test runner set up. This means separate components can be created and tested individually or collectively when integrated into an application.
Routing is another great feature because it helps divide an application into logical views and binds different views to a Controller. This way multiple templates can be used within a single page application. It can also be used to create multiple URLs for different content within an application.
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